Wilson, Ira G., author
John Wiley & Sons, 1965
Buku Teks
John Newton author
Routledge , 1992
Buku Teks
White, Ron, author
Ziff-Davis Press, 1993
Buku Teks
edited by Sybil P. Parker
New York, McGraw-Hill
Buku Referensi
Scheid, Francis, author
McGraw-Hill, 1983
Buku Teks